/**
 * Copyright 2021 jianggujin (www.jianggujin.com).
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.jianggujin.modulelink.support;

import java.util.Map;

/**
 * 一个空的Bean提供者服务
 * 
 * @author jianggujin
 *
 */
public class JEmptyBeanProvider extends JAbstractBeanProvider {
    private static volatile JEmptyBeanProvider instance;

    private JEmptyBeanProvider() {
    }

    @Override
    public <T> T optBean(Class<T> requiredType) {
        return null;
    }

    @Override
    public Object optBean(String name) {
        return null;
    }

    @Override
    public <T> T optBean(String name, Class<T> requiredType) {
        return null;
    }

    @Override
    public String[] optBeanNamesForType(Class<?> requiredType) {
        return null;
    }

    @Override
    public <T> Map<String, T> optBeansOfType(Class<T> requiredType) {
        return null;
    }

    public static JEmptyBeanProvider getInstance() {
        if (instance == null) {
            synchronized (JEmptyBeanProvider.class) {
                if (instance == null) {
                    instance = new JEmptyBeanProvider();
                }
            }
        }
        return instance;
    }
}
